IN THE COCOS'KMELJNG ISLANDS. 



23 



I examined the chart made by Eoss in 1825, ten years 

 before Mr, Darwin's visit, but it exhibited no perceptible 

 difference in the external confignration of tlie varions islets. 

 The soundings in the lagoon, however, showed a greater 

 contiimuuii di?pth at that time, and I am toUl that his vessel 

 sailed, on her firat coming, far up the bay, and anchored 

 where now no ship can nearly approach. It is more probable 

 that the explanation of this dead field lies in the supposition 

 that a like phenomenon to that just narrated accompanied the 

 earthr[uake of 1834. Beyond the boundary affected by the 

 dark water, the coral was unharmed, and growing vigorously 

 in thick bosses, (called " patches " by Mt. Darwin,) composed 

 chiefly of Madrepam and Poeilhiwaf between which were 

 basins of no great diameter, but reaching to a depth of some 

 eight or ten fathoms, which were marvellous natural aquaria 

 planted round with anemones, tesselated in blue and green 

 designs with Fmiffm and brain-comla But why no other 

 species should grow in these deep clear pits, and why the 

 varions corals forming the bosses — which are chiefly of 

 Echimpora lamellosa — do not stretch out their arms into 

 and obliterate them, seems difficult to understand. 



la the small boat channel close to the settlement, one of the 

 few poisoned places in which the coral had begun to grow 

 vigorously since 1876, I dislodged with my hand several 

 living bunches from the chalky bottom on which they 

 were growing. Their average di^imeter across the top was 

 12 inches, and their height from the centre to the tip of 

 the branches 6| inches. This channel was thoroughly 

 cleaned out Aovm to the white mud on the 20th Atay, 1878, 

 and as my measurements were made on the 30th January, 

 1879, the age of these bunches was under eight and a half 

 months. 



1 could not help being stnick by the number of brilliantly 

 hucd fishes in the deep pools of the lagoon. Banded and 

 spotted Murcenoids (species of Lmnranm and Opisurm) glided 

 about in snake-like tashion ; in sea- weed or hydroid-covered 

 crevices motionleas Antetmarii lay in wait, but it required a 

 sharp eye to distinguish their quaintly adorned and mimicking 

 bcKlies from the excrescences of their retreat. Other singular 

 denizens of the lagoon are the Crayracions, which look like 



